public class Example3_6 {
    public static void main(String args []) {
    double sum = 0,item = 1;
    int i = 1,n = 20;
    while(i<=n) {
      sum = sum=item;
      i=i+1;
      item = item*(1.0/i);
        }
     System.out.println("sum="+sum);
    }
}
